Patent US 3809899A
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| Patent number | US 3809899A (click link for details and documents via Google Patents) |
|---|---|
| Title | Electron-beam tube including a thermionic-field emission cathode for a scanning electron microscope |
| Inventors | T Baker, M Balsiger, K Considine, H Litsjo |
| Company | Tektronix Inc |
| Filing date | 1972-08-17 |
| Grant date | 1974-05-07 |